Yes you can, I would suggest getting there early so you can get a spot or check in with the park rangers to give them a heads up!
Yes but you should check in at the main building so the park guards know what and when you are going to have the picnic . They may have good suggestions were would be the best spot to have the picnic.
Yes you just have to get there at 8am to set up. You can sit next to the pool area ok
Yes you can
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